They vary greatly. Some properties may have none, while others may have a 5-10 (or more) foot wide easement along one of the property lines for utilities or public access. The best way to determine any easements is by referring to a plat of survey for your property.
This is a legal term that is refering to shared property on propery bounderies. These are often used for gas lines or sewer lines that are above or bellow ground.
An easement is a legal right or privilege that someone has in another's land such as a right of way. As such, the distance of an easement for a particular property depends upon the exact legal agreement reached between the property owner and person who holds the easement.
The distance of easement for properties varies from community to community. You will need to check with your local appraisal district in order to see what the easements are. These can include the utilities companies, as well as the city or county easement on sidewalks and driveways. A surveyor should be able to mark them out for you.